Shipping Container: Sidewall Inserts

Sidewall Insert with Rigid Sheet Foam

Sidewall Insert and Rigid Sheet Foam

  •  The sidewall of a shipping container interior applications.  If you just need to just insulate a container for storage and covering the insulation for fire safety and protection is not a concern we recommend the (I-SWI) Side Wall Inserts to infill the wall's corrugated voids to prevent hidden condensation. The flat stock foam panels and inserts is a three-step process insulated first with the (I-SWI) Side Wall Inserts to infill the wall's corrugated voids preventing hidden condensation. Then locally sourced (48″ x 96″) flat stock sheet insulation are installed over the inserts completing the continuous thermal layer before the traditional interior framing and services can be installed. This is the least expensive method available but increase the labor, material co-ordination and complexity in details.Then install locally sourced board stock insulation over the steel containers exposed metal surfaces.
            1. Inexpensive method when modifying older containers with dings and dents prevent cold condensation surfaces.
            2. Method when modifying older containers with dings and dents.
            3. Industrial fast track application not suitable for habitual spaces, storage only.
              • Check with local code restrictions for exposed foam insulation fire requirements.
            4. Traditional framing, wood or steel studs, would need to be installed with drywall and optional additional insulation in order to make the container into a habitable space

Sidewall Inserts:

        • (I-SWI Side Wall Inserts) = 30 pieces 48 inches long covering 120 lineal feet of corrugation in-fill or (15) 8′ tall sections
Products Required

(I-SWI Side Wall Inserts)

Buy Shipping Container Insulation Panels in Bakersfield, CA


Side Wall Inserts

One box of Side Wall Inserts covers 112 Lineal feet of corrugation.

Dimensioned to fit

48in x 7 3/4in x 1 1/4 in


2.5 sq-ft

R-Value ASTM C518


Closed-Cell, injection-molded EPS 

ASTM C578 Type II

Canadian Standards

CAN/ULC S701 Type 2

Foam Density

1.00 lbs per cubic foot

Installing a Wood Buck into a Container

First Things First

Safety Precaution: Cut out all openings in the container and complete any welding, cutting or grinding operations prior to installing InSoFast panels. Do not expose the foam insulation or plastic studs of InSoFast panels to the flames, heat or sparks generated by welding, grinding or cutting on the steel container after panels have been installed. 

See this page for in depth instruction for installing wood bucks. MORE

Determine your window layout first. We suggest that you adjust your openings to the right or left up and down to simplify other steps  later on. If you invested in a sample kit use the side wall insert to help you mark your layout lines.To fasten the interior half of the buck we used special fasteners fro ITW with a drill bit and metal wings that over drill the wood then break-off to allow the screw to anchor itself to the steel container wall.

The window bucks are complete and ready to finish. Next step is to insulate the interior walls with the Sidewall Inserts and the UX2.0 Flat panels.

Installing Sidewall Inserts into a Container

The long sidewalls of the shipping container insulated with Sidewall Inserts. 

The long sidewalls of the shipping container is a three-step process using Sidewall Inserts, locally sourced flat stock sheet foam, and traditional framing systems.

Place a bead of adhesive in an “S” pattern down the center of the backside of the sidewall insert. Set the inserts into the lower half of the sidewall corrugations. Once in place seal the top of the insert with a bead of spray foam. Continue to cut, fit and glue all the insert onto the sidewall corrugations. Spray foam and seal all your work.

Flat board stock foam and framing by others.

*Locally Sourced Foam Insulation by others:
Interior sheet foam Insulation required: 20' Standard 20' High Cube 40' Standard 40' High Cube
Foam Board Insulation by others: 3/4" x 4' x 8' 3/4" x 4' x 8' 3/4" x 4' x 8' 3/4" x 4' x 8'
Total square feet w/o swing doors 472 520 950 1016
Total 4'x8' sheet foam panels 15

Other Insert Installation Navigation:

InSoFast Plus Method

Need a higher R-value? No Problem! Start with a base of InSoFast continuous insulation panels they are feature-rich and easy to install. Then add rigid foam insulation over top of InSoFast panels.